14 July 2012

CBSE VIII: Biology :Microorganisms: Objective Questions

1. The curd contains -----a bacterium which helps to change the milk into curd 
Lacto bacillus 
2. -------------is used for commercial production of alcohol and wine. 
Yeast 
3. Process of conservation of sugar into alcohol is known as ---------------- 
Fermentation. 
4. Disease causing microorganisms are called ------------------------- 
Pathogens 
5. Virus is a Latin word which means ----------------- 
Poison
6. Virus is a Latin word which means------------------. 
Poison 
7. ------------ are on the border line between living and non-living organisms 
Virus 
8. The study of bacteria is called ------------------------ 
Bacteriology. 
9. Virus was discovered by ------------ in 1892 
Ivanowsky 
10. ------------ Viruses show both living and non-living characteristics 
Virus 
11. The study of bacteria is called ----------- 
Bacteriology 
12. Bacteria were first observed under a microscope by ------------------ 
Anton Von Leeuwenhoek 
13. The study of algae is called ------------------- 
Phycology 
14. Cocci is ----------shaped) where as Bacilli is --------------shaped bacteria. 
Spherical, Rod 
15. -------------------is a unicellular green algae 
Chlamydomonas 
16. The study of fungi is called -------------- 
Mycology. 
17. Fungi do not possess ---------and led a lead a parasitic or saprophytic mode of life. 
Chlorophyll 
18. A black powdery spot with a network of thread like filaments in fungi , called ----- 
Hyphae 
19. Azatobactor, Clostridium, Rhizobium are ---- fixing bacteria. 
Nitrogen 
20. Oscillatoria, Anabaena and Nostoc are - which increase the soil fertility by fixing atmospheric nitrogen. 
Blue green algae 
21. Vinegar is manufactured from sugar solution using ----------- 
Acetobacter aceti. 
22. Some algae produce dense masses of materials that cover the water surface, thereby decrease the oxygen content of water is called ………….. 
Algal bloom 
23. -----------------is a science which deals with diseases of plants, animals and human beings caused by viruses, bacteria and fungi. 
Pathology 
24. Algal bloom leads to loss of species diversity which is known as ------- 
Eutrophication 
25. Milk is heated to 72oC for 30 minutes and then suddenly cooled to 12oC.is called -----
Pasteurization

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